CN115898367B - Measurement device for advanced geological forecast drilling of tunnel and application method thereof - Google Patents
Measurement device for advanced geological forecast drilling of tunnel and application method thereof Download PDFInfo
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- CN115898367B CN115898367B CN202211391613.3A CN202211391613A CN115898367B CN 115898367 B CN115898367 B CN 115898367B CN 202211391613 A CN202211391613 A CN 202211391613A CN 115898367 B CN115898367 B CN 115898367B
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Abstract
The invention discloses a measuring device for advanced geological forecast drilling of a tunnel and a using method thereof, comprising the following steps: the drilling device comprises a pipe shoe, a drill pipe and a measuring pipe, wherein the drill pipe and the pipe shoe are connected into a combined body through screw threads, one end of the measuring pipe is connected to one end of the drill pipe through screw threads, the other end of the measuring pipe is clamped by a drilling machine clamp holder, a pressure gauge and a valve are arranged on the peripheral wall of the measuring pipe, the inner peripheral wall of the other end of the measuring pipe is connected with a water shutoff connector through screw threads, the measuring pipe, the pressure gauge, the valve and the water shutoff connector form the measuring device, the pipe shoe and the outer peripheral wall of the drill pipe are attached to the inner peripheral wall of a large drilling hole, the drill pipe for drilling is used for attaching to the inner peripheral wall of a small drilling hole, and the inner peripheral wall of the drill pipe for drilling is provided with a core barrel, and the device has the beneficial effects that: the method is suitable for the layer-by-layer safety measurement of the water burst pressure and the water quantity of the advanced drilling holes in middle or long distances and the water burst pressure and the water quantity of multiple water-bearing layers.
Description
Technical Field
The invention relates to the technical field of advanced geological forecast drilling of tunnels, in particular to a device for measuring advanced geological forecast drilling of tunnels and a use method thereof, which are used for measuring water pressure and water quantity of the advanced geological forecast drilling of tunnels.
Background
The advanced geological forecast of the tunnel aims to find out engineering geology and hydrogeological conditions in front of the tunnel excavation working face, provide geological basis for optimizing engineering design, reduce probability and hazard degree of geological disasters and guide the tunnel excavation engineering construction to be carried out smoothly. Advanced drilling refers to advanced geological coring drilling on a tunnel excavation working face or a side hole thereof along the excavation advancing direction, so as to ascertain geological conditions in front of the excavation working face, and is an important technical method for advanced geological forecasting. The advanced drilling can also be used for releasing stratum stress and avoiding rock burst. Practical experience shows that a large amount of water, gas, coal slurry, gravel and the like can be sprayed out of the drilled holes in the process of drilling holes in various tunnels such as railways, highways, hydroelectric engineering and the like, so that the construction safety is not facilitated, and even personnel injury accidents can be caused to operators near the holes. Especially, the probability of water gushing is high when horizontal or near-horizontal drilling with deeper construction depth is performed in various tunnels with large burial depth and long distance. When water burst occurs in the drilling hole, parameters such as water burst quantity, water burst pressure, water temperature and the like of the hole opening are required to be measured. Currently, the advanced drilling depth in a tunnel is generally within thirty meters, and belongs to short-distance forecasting. In the depth range of the hole, the safety risk generated by water burst, gas burst and other phenomena in the hole is small, and the corresponding safety device and the measuring device are simpler.
Such as: CN208564455U discloses an orifice device for tunnel drilling construction, wherein the orifice device provided adopts the contact of a supporting ring and a baffle plate to realize the purpose of water blocking and water draining, and has no measuring function. CN209858347U discloses a water pressure detection device for engineering, which is only used for measuring water pressure.
The two devices have single functions and small application range, and are not suitable for safety measurement under complex conditions such as large water inflow and water inflow pressure when the middle and long distances are drilled in advance and when a plurality of water-bearing layers exist, the water inflow and the water pressure need to be measured layer by layer.
Disclosure of Invention
The invention aims to provide a tunnel advanced geological forecast drilling measuring device and a using method thereof, which solve the technical problems that the prior tunnel advanced geological forecast drilling measuring device has single function and is not suitable for measuring advanced drilling over short distances, and the tunnel advanced geological forecast drilling measuring device has single function and is not suitable for safety measurement under complex conditions such as large water inflow, large water inflow pressure and water inflow when the tunnel advanced geological forecast drilling measuring device is used for medium-long distance and long-distance advanced drilling, and the water inflow and water pressure are required to be measured layer by layer when a plurality of aquifers are arranged.
The invention is realized by the following technical scheme:
the utility model provides a measuring device of tunnel advance geological forecast drilling which characterized in that includes:
a boot;
the drill rod and the pipe shoe are connected into a combined body through screw threads, and are used for being matched in a large drilling hole in a autorotation mode, and when the large drilling hole is deeper, a plurality of drill rods can be connected;
the measuring pipe is used for measuring water inflow and water inflow pressure of advanced drilling, one end of the measuring pipe is connected to one end of the drill rod through threads, a pressure gauge and a valve are arranged on the peripheral wall of the measuring pipe, the inner peripheral wall of the other end of the measuring pipe is connected with a water shutoff connector through threads, and the measuring pipe, the pressure gauge, the valve and the water shutoff connector form a measuring device.
The pipe shoe is connected to the left end of the drill rod through threads, and the nominal caliber of the pipe shoe and the drill rod is one level larger than the caliber of the opening designed by the small drilling hole.
The nominal caliber of the measuring tube is consistent with that of the drill rod, and the left end of the measuring tube is connected with the right end of the drill rod through screw threads.
The pressure gauge and the valve arranged on the peripheral wall of the measuring tube are respectively connected with the peripheral wall of the measuring tube, and the number of the valves is multiple.
The left end of the water shutoff connector playing a role in water shutoff is connected with the right end of the measuring tube through a screw thread, and the right end of the water shutoff connector is connected with the power head of the drilling machine.
The distance d between the right end face of the drill rod and the face is within the range of 0.3 meter.
The left end of the drill rod is provided with a drill hole, the core barrel and the drill rod for drilling are positioned in the drill hole, and the left side of the drill rod for drilling is provided with the core barrel.
The pressure gauge has a pressure gauge connection through which the measuring tube opens into the interior of the measuring tube.
The valve has a valve connection through which the measuring tube opens into the interior of the measuring tube.
The utility model provides a tunnel advanced geological forecast drilling's measuring device's application method, is applied to a tunnel advanced geological forecast drilling water pressure and water yield measuring device, includes:
s1: installing a drilling machine, so that the distance between the drilling position on the tunnel face of the tunnel and a drilling machine clamp holder is in the range of 0.8-1.2 meters;
s2: drilling and coring by using a coring bit and a coring drilling tool with the same diameter as the drill rod until the drilling reaches the complete bedrock to form a large drilling hole, wherein the drilling depth of the coring bit and the coring drilling tool is based on the condition that the drill rod can be manually rotated to carry out screw thread disassembly;
s3: providing a core drilling tool and a core drilling bit of a large drilling hole, connecting a pipe shoe and a drill rod to form a combined body, putting the combined body into the large drilling hole, and controlling the length of the drill rod well to ensure that the distance of the right end surface of the drill rod beyond the working face is within the range of 0.3 meter;
s4: the core drilling tool and the core drilling bit of the small level are replaced, the drill rod for drilling is matched, and the drill rod is put into a large drill hole to continue drilling and coring. The bottom surface of a small drilling hole drilled by a small-level core drill bit and the bottom surface of a large drilling hole form an annular step surface, and the left end of a combined body formed by connecting a pipe shoe and a drill rod is seated on the annular step surface;
s5: when the water bearing layer is in need of measurement, fishing out a core barrel in the core drilling tool, lifting a drilling rod for drilling out of the water bearing layer, and controlling the right end of the drilling rod for drilling to exceed the range of 0.3 m of the right end face of a combination body formed by connecting a pipe shoe of the measuring device and the drilling rod;
s6: installing a measuring device, namely opening all valves on a measuring tube to play a role of drainage and pressure relief so as to facilitate manual installation, enabling the left end of a combination of the measuring tube and a water shutoff connector to pass through a drilling machine clamp holder, enabling the right end of a combination formed by connecting a pipe shoe and a drill rod which are arranged in a drill hole to be in butt joint with the left end of the combination of the measuring tube and the water shutoff connector, clamping the combination of the measuring tube and the water shutoff connector by using the drilling machine clamp holder when two ends are just contacted, and then connecting a drilling machine power head with the water shutoff connector;
s7: manually rotating a combination body formed by connecting a pipe shoe and a drill rod to enable the pipe shoe to be in threaded connection with a combination body of a measuring pipe and a water shutoff connector, wherein when the pipe shoe is in threaded connection, the left end face of the pipe shoe can be separated from an annular step face along with the tightening of the threads, in order to enable the left end face of the pipe shoe to be better in contact and seal with the annular step face, loosening a drill holder, operating a drill feeding oil cylinder to push the whole measuring device to the annular step face and giving a certain compression force to prevent water from leaking from the pipe shoe and flushing the measuring device due to water pressure;
s8: a water outlet of the valve is connected with a container or a triangular weir box by using a rubber pipe, and the water inflow can be measured by a volumetric method or a triangular weir method by opening the valve;
s9: closing the valve to measure the water burst pressure of the drilling hole;
s10: after the measurement is finished, the connection between the drill rod of the measuring device and the measuring tube is manually detached, the combination of the measuring tube and the water shutoff connector is proposed, and then the drill rod for drilling proposed in the step S5 is connected again and is put into a small drill hole, and drilling coring is resumed.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention relates to a tunnel advanced geological forecast drilling measurement device which is suitable for safety measurement under complex conditions such as large water inflow and water inflow pressure when in advanced drilling in medium-long distance and when a plurality of water-bearing layers exist and the water inflow and water pressure need to be measured layer by layer.
2. The invention has simple structure and convenient operation, is widely applicable to top-drive type and through hole type full hydraulic drilling machines, can rapidly measure water inflow and water inflow pressure, has almost no influence on the normal drilling coring process, and can realize the layer-by-layer measurement of water inflow and water inflow of each aquifer by lifting the drill rod to the top plate of the aquifer after the aquifer is drilled again and meeting the aquifer.
3. The pipe shoe and the drill rod of the whole measuring device are in sealing joint in a large drilling hole, a small drilling hole is continuously drilled on the basis of the large drilling hole, the inner wall of the small drilling hole is in sealing joint through the drill rod for drilling, if the small drilling hole is drilled and needs to be measured when meeting a water-bearing layer, a core barrel is put forward, the left end of a measuring pipe of the measuring device is connected with the drill rod, the right end of the measuring pipe is connected with a water plugging joint, the measuring pipe can be used for measuring the water quantity and the water pressure of the water-bearing layer, and the small drilling hole is advanced by a certain distance relative to a tunnel face, so that the measurement of advanced geological forecast drilling hole is realized.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic view of the overall structure provided by the present invention when installed in an orifice;
FIG. 2 is a schematic diagram showing the state of step S3 of the method according to the present invention;
fig. 3 is a schematic diagram illustrating a state of step S7 of the method according to the present invention.
In the drawings, the reference numerals and corresponding part names:
1-pipe shoe, 2-drill rod, 3-measuring pipe, 31-pressure gauge interface, 32-valve interface, 4-pressure gauge, 5-valve, 6-water shutoff connector, 7-drilling hole, 8-rock, 9-face, 10-drill rod, 11-annular step face.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "beyond", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present invention.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1-3, the present embodiment provides a measurement device for advanced geological forecast drilling of a tunnel, including: pipe shoe 1, drilling rod 2 and survey buret 3, drilling rod 2 and pipe shoe 1 pass through the screw thread and connect into the assembly for but the cooperation of rotation is in big drilling, and survey buret 3 is used for measuring the water inflow and the water inflow pressure of leading drilling, and survey buret 3's one end passes through the screw thread and connects in the one end of drilling rod 2, is provided with manometer 4 and valve 5 on survey buret 3's the periphery wall, and survey buret 3's the inner peripheral wall of the other end is connected with water shutoff connector 6 through the screw thread, survey buret 3 manometer 4, valve 5 and water shutoff connector 6 constitute measuring device.
The pipe shoe 1 is connected to the left end of the drill rod 2 through threads, and the nominal caliber of the pipe shoe 1 and the drill rod 2 is one level larger than the caliber of the opening of the small drilling design.
The nominal caliber of the measuring tube 3 is consistent with that of the drill rod 2, and the left end of the measuring tube 3 is connected with the right end of the drill rod 2 through screw threads.
The pressure gauge 4 and the valve 5 arranged on the peripheral wall of the measuring tube 3 are respectively connected with the peripheral wall of the measuring tube 3, and a plurality of valves 5 are arranged.
The left end of the water shutoff connector 6 playing a role in water shutoff is connected with the right end of the measuring tube 3 through a screw thread, and the right end of the water shutoff connector 6 is connected with a power head of a drilling machine.
The distance d between the right end face of the drill rod 2 and the face 9 is within the range of 0.3 meter.
The left end of the drill rod 2 is provided with a drilling hole 7, a core barrel and a drill rod 10 for drilling are positioned in the drilling hole 7, the left side of the drill rod 10 for drilling is provided with the core barrel, and the distance b between the right end of the drill rod 10 for drilling and the right end face of the combination body formed by connecting the pipe shoe 1 and the drill rod 2 exceeds the range of 0.3 meter.
The pressure gauge 4 has a pressure gauge connection 31, through which the measuring tube 3 opens into the interior of the measuring tube 3.
The valve 5 has a valve connection 32, through which valve connection 32 the measuring tube 3 opens into the interior of the measuring tube 3.
Example 2
The application method of the device for measuring the advanced geological forecast drilling of the tunnel is applied to the device for measuring the water pressure and the water quantity of the advanced geological forecast drilling of the tunnel, and comprises the following steps:
s1: installing a drilling machine, so that the distance between the drilling position on the tunnel face 9 of the tunnel and a drilling machine clamp holder is in the range of 0.8-1.2 meters;
s2: drilling and coring by using a coring bit and a coring drilling tool with the same diameter as the drill rod 2 until the drilling reaches the complete bedrock to form a large drilling hole, wherein the drilling depth of the coring bit and the coring drilling tool is based on the condition that the drill rod can be manually rotated to carry out screw thread disassembly;
s3: providing a core drilling tool and a core drill bit of a large drilling hole, connecting a pipe shoe 1 and a drill rod 2 to form a combined body, putting the combined body into the large drilling hole, and controlling the length of the drill rod 2 so that the distance of the right end surface of the drill rod 2 beyond the working face 9 is within the range of 0.3 meter;
s4: the drilling rod 2 for drilling is used in a matching way, the drilling rod 2 for drilling is put into a large drilling hole to continue drilling and coring, the small drilling hole drilled by the small-level coring bit and the bottom surface of the large drilling hole form an annular step surface 11, and the left end of a combined body formed by connecting the pipe shoe 1 and the drilling rod 2 is seated on the annular step surface 11;
s5: when the water bearing layer is in need of measurement, fishing out a core barrel in the core drilling tool, lifting a drilling rod 10 for drilling out of the water bearing layer, and controlling the right end of the drilling rod 10 for drilling to exceed the range of 0.3 m of the right end face of a combination body formed by connecting a pipe shoe 1 of a measuring device and a drilling rod 2;
s6: installing a measuring device, namely firstly, fully opening all valves 5 on a measuring tube to play a role in drainage and pressure relief, so that the manual installation is facilitated, enabling the left end of a combination of the measuring tube 3 and a water shutoff connector 6 to pass through a drilling machine clamp holder, enabling the right end of a combination formed by connecting a pipe shoe 1 and a drill rod 2 which are arranged in a drill hole to be in butt joint with the left end of the combination of the measuring tube 3 and the water shutoff connector 6, clamping the combination of the measuring tube 3 and the water shutoff connector 6 by using the drilling machine clamp holder when two ends are just contacted, and then connecting a drilling machine power head with the water shutoff connector 6;
s7: manually rotating a combination body formed by connecting the pipe shoe 1 and the drill rod 2 to enable the combination body to be in threaded connection with a combination body of the measuring pipe 3 and the water shutoff connector 6, wherein when the combination body is in threaded connection, the left end face of the pipe shoe is separated from the annular step face 11 along with the tightening of the threads, in order to enable the left end face of the pipe shoe 1 to be better in contact and seal with the annular step face 11, loosening a drill holder, operating a drill feeding oil cylinder to push the whole measuring device to the annular step face 11 and giving a certain pressing force to prevent water from leaking from the pipe shoe 1 and flushing the measuring device out due to water pressure;
s8: the water outlet of the valve 5 is connected with a container or a triangular weir box by using a rubber tube, and the water inflow can be measured by a volumetric method or a triangular weir method after the valve is opened;
s9: closing the valve 5 to measure the water burst pressure of the drilling hole;
s10: after the measurement is finished, the connection between the drill rod 2 of the measuring device and the measuring tube 3 is manually disconnected, the combination of the measuring tube 3 and the water shutoff connector 6 is proposed, and then the drilling drill rod 10 proposed in the step S5 is connected again and is put into a small drill hole, and drilling and coring are resumed.
Example 3
As shown in figures 1-3, the invention starts to carry out advanced drilling measurement on the rock 8 from the right side of the rock 8, the pipe shoe 1 and the drill rod 2 of the whole measuring device are sealed and attached in a large drill hole, the small drill hole is continuously drilled on the basis of the large drill hole, the inner wall of the small drill hole is sealed and attached through the drill rod 10 for drilling, if the small drill hole drills into a water-bearing layer to be measured, a core barrel is put forward, the left end of the measuring pipe 3 of the measuring device is connected with the drill rod 2, the right end of the measuring pipe 3 is connected with the water plugging connector 6, the measuring pipe 3 can test the water quantity and the water pressure of the water-bearing layer, and the measurement of advanced geological forecast drilling is realized because the small drill hole advances a certain distance relative to the face.
Example 4
The invention has simple structure and convenient operation, is widely applicable to top-drive type and through hole type full hydraulic drilling machines, can rapidly measure water inflow and water inflow pressure, has almost no influence on the normal drilling coring process, and can realize the layer-by-layer measurement of water inflow and water inflow of each aquifer by lifting the drill rod to the top plate of the aquifer after the aquifer is drilled again and meeting the aquifer.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (1)
1. A method for using a measuring device for advanced geological forecast drilling of a tunnel is characterized in that,
the measuring device includes:
a pipe shoe (1); the drill rod (2) is connected with the pipe shoe (1) through screw threads to form a combined body, and is used for being matched in a large drilling hole in a autorotation mode; the measuring pipe (3) is used for measuring water inflow and water inflow pressure of advanced drilling, one end of the measuring pipe (3) is connected to one end of the drill rod (2) through threads, the outer peripheral wall of the measuring pipe (3) is provided with the pressure gauge (4) and the valve (5), the inner peripheral wall of the other end of the measuring pipe (3) is connected with the water shutoff connector (6) through threads, and the measuring pipe (3), the pressure gauge (4), the valve (5) and the water shutoff connector (6) form a measuring device;
the pipe shoe (1) is connected to the left end of the drill rod (2) through threads, and the nominal caliber of the pipe shoe (1) and the drill rod (2) is one level larger than the caliber of an opening designed by a small drilling hole;
the nominal caliber of the measuring tube (3) is consistent with that of the drill rod (2), and the left end of the measuring tube (3) is connected with the right end of the drill rod (2) through screw threads;
the pressure gauge (4) and the valves (5) arranged on the peripheral wall of the measuring tube (3) are respectively connected with the peripheral wall of the measuring tube (3), and a plurality of valves (5) are arranged;
the left end of the water shutoff connector (6) playing a role in water shutoff is connected with the right end of the measuring tube (3) through a screw thread, and the right end of the water shutoff connector (6) is connected with a power head of a drilling machine;
the distance (d) between the right end surface of the drill rod (2) and the face surface (9) is within the range of 0.3 meter;
the left end of the drill rod (2) is provided with a drill hole (7), a core barrel and a drill rod (10) for drilling are positioned in the drill hole (7), and the left side of the drill rod (10) for drilling is provided with the core barrel;
the pressure gauge (4) has a pressure gauge connection (31), the measuring tube (3) opening into the interior of the measuring tube (3) via the pressure gauge connection (31);
the valve (5) has a valve connection (32), the measuring tube (3) opening into the interior of the measuring tube (3) via the valve connection (32);
the using method comprises the following steps:
s1: installing a drilling machine, so that the distance between the drilling position on the tunnel face (9) of the tunnel and a drilling machine clamp holder is in the range of 0.8-1.2 meters;
s2: drilling and coring by using a coring bit and a coring drilling tool with the same diameter as the drill rod (2) until the drilling reaches the complete bedrock to form a large drilling hole, wherein the drilling depth of the coring bit and the coring drilling tool is determined by manually rotating the drill rod to disassemble threads;
s3: providing a core drilling tool and a core drilling bit of a large drilling hole, connecting a pipe shoe (1) and a drill rod (2) into a combined body, and putting the combined body into the large drilling hole, and controlling the length of the drill rod (2) so that the distance between the right end surface of the drill rod (2) and a face surface (9) is within the range of 0.3 m;
s4: a small-level coring drilling tool and a coring bit are replaced, a drilling rod (2) is matched with the small-level coring drilling tool, the drilling rod is put into a large drilling hole, the drilling and the coring are continued, the bottom surface of the small drilling hole and the bottom surface of the large drilling hole drilled by the small-level coring bit form an annular step surface (11), and the left end of a combined body formed by connecting a pipe shoe (1) and the drilling rod (2) is seated on the annular step surface (11);
s5: when the water bearing layer is in need of measurement, fishing out a core barrel in the core drilling tool, lifting a drilling rod (10) for drilling out of the water bearing layer, and controlling the right end of the drilling rod (10) to exceed the range of 0.3 m of the right end face of a combined body formed by connecting a pipe shoe (1) of a measuring device and a drilling rod (2);
s6: the method comprises the steps of installing a measuring device, firstly, fully opening all valves (5) on a measuring tube to play a role in drainage and pressure relief, so that manual installation is facilitated, enabling the left end of a combination of the measuring tube (3) and a water shutoff connector (6) to penetrate through a drilling machine clamp holder, enabling the right end of a combination formed by connecting a pipe shoe (1) arranged in a drilling hole and a drill rod (2) to be in butt joint with the left end of a combination of the measuring tube (3) and the water shutoff connector (6), and when two ends are just contacted, clamping the combination of the measuring tube (3) and the water shutoff connector (6) by using the drilling machine clamp holder, and then connecting a drilling machine power head with the water shutoff connector (6);
s7: manually rotating a combination body formed by connecting the pipe shoe (1) and the drill rod (2) to enable the combination body to be in threaded connection with a combination body of the measuring pipe (3) and the water shutoff connector (6), wherein when the combination body is in threaded connection, the left end face of the pipe shoe can be separated from the annular step surface (11) along with the tightening of the threads, so that the left end face of the pipe shoe (1) is better in contact and seal with the annular step surface (11), a clamp holder of a drilling machine is loosened, a feeding cylinder of the drilling machine is operated to push the whole measuring device to the annular step surface (11) and a certain compression force is applied to prevent water from leaking from the pipe shoe (1) and the measuring device from being flushed out due to water pressure;
s8: a water outlet of the valve (5) is connected with a container or a triangular weir box by using a rubber tube, and the water inflow can be measured by a volumetric method or a triangular weir method by opening the valve;
s9: closing the valve (5) to measure the water burst pressure of the drilling hole;
s10: after the measurement is finished, the connection between the drill rod (2) of the measuring device and the measuring tube (3) is manually detached, the combination of the measuring tube (3) and the water shutoff connector (6) is proposed, and then the drill rod (10) for drilling proposed in the step S5 is connected again and is put into a small drill hole, and drilling and coring are recovered.
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